[MMUSIC] I-D Action: draft-ietf-mmusic-media-path-middleboxes-05.txt

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Subject: [MMUSIC] I-D Action: draft-ietf-mmusic-media-path-middleboxes-05.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
 This draft is a work item of the Multiparty Multimedia Session Control Working Group of the IETF.

	Title           : Analysis of Middlebox Interactions for Signaling Protocol Communication along the Media Path
	Author(s)       : Brian Stucker
                          Hannes Tschofenig
                          Gonzalo Salgueiro
	Filename        : draft-ietf-mmusic-media-path-middleboxes-05.txt
	Pages           : 22
	Date            : 2012-07-10

   Middleboxes are defined as any intermediary box performing functions
   apart from normal, standard functions of an IP router on the data
   path between a source host and destination host.  Two such functions
   are network address translation and firewalling.

   When Application Layer Gateways, such as SIP entities, interact with
   NATs and firewalls, as described in the MIDCOM architecture, then
   problems may occur in the transport of media traffic when signaling
   protocol interaction takes place along the media path, as it is the
   case for recent key exchange proposals (such as DTLS-SRTP).  This
   document highlights problems that may arise.  Unfortunately, it is
   difficult for the end points to detect or predict problematic
   behavior and to determine whether the media path is reliably
   available for packet exchange.

   This document aims to summarize the various sources and effects of
   NAT and firewall control, the reasons that they exist, and possible
   means of improving their behavior to allow protocols that rely upon
   signaling along the media path to operate effectively.

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